JPS62170543A - False twisted processed yarn for stockings - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a false-twisted yarn having a highly monophasic elongation recovery characteristic, which provides soft and transparent stockings with little appearance unevenness.

Conventional technology Conventionally, pantyhose or stockings (hereinafter referred to as
The materials for stockings (collectively referred to as stockings) are generally polyamide-based synthetic fibers such as woolly processed yarn and torque processed yarn, and stockings that take advantage of the characteristics of each are obtained. Among them, woolly processed yarn is used in large quantities because it can be produced at low cost and can be used as stockings in one size fits most. However, woolly processed yarn does not satisfy all requirements, and added value such as soft feel, transparency, and beautiful appearance of stockings are required. In response to this demand, for example, as a method to give woolly processed yarn a soft and transparent feel,
A method of reducing the total denier by thinning the filament denier is used, but the soft feel and transparency are improved, but there are defects that cause problems in durability when worn. Another method is to reduce the denier of the filaments and keep the total denier constant (increasing the number of filaments), but this improves the softness, but reduces the fit and transparency. On the other hand, in order to increase the transparency, a method is used in which the total denier is kept constant and the number of filaments is decreased (the filament denier becomes thicker), but although the transparency is improved, the softness and transparency are lacking. My feelings tended to be contradictory, and nothing satisfied me when it came to stockings.

Problems to be Solved by the Invention As a result of intensive research into a false-twisted yarn that has the characteristics of one-size-fits-all, soft feel, transparency, and beautiful appearance required for stockings, the inventor has developed a false-twisted yarn. The present invention was achieved by discovering that the cross-sectional shape of the filament of the thread has a large effect on these performances.

Means to solve problems The gist of the present invention is as follows.

False-twisted yarn for stockings, which is a multifilament of polyamide synthetic fiber, and is formed by false-twisting raw yarn having a flat shape with a cross section of 1.3 to 2.5. However, the flatness is a value expressed as a/b when the cross section of the filament is surrounded by a circumscribed rectangle whose long sides are parallel to the longest part, and where the long side (a) and the short side (b) are taken as the long side (a) and short side (b).

The characteristics of the present invention are particularly demonstrated by the woolly processing method, and it is possible to obtain a soft feeling, transparency, and beautiful appearance when wearing stockings without impeding the elongation recovery characteristics of woolly processed yarn. This has an important meaning in limiting the flatness of the filament and supplying it to the false twisting process.

The raw yarn as used in the present invention means a straight yarn as opposed to a processed yarn, and includes undrawn yarn, POY, and drawn yarn.

Things that impair the appearance of stockings include course spots, glossy spots, and fibrillation spots of processed yarn. This is due to the filament cross-sectional shape of the textured yarn having a polygonal shape with an acute angle as shown in FIG.

In order to transform this polygonal filament cross section with acute angles into a filament cross section with many mild obtuse angles as shown in Figure 1 (b), the filament cross section of the raw yarn to be fed to the false twisting process must be flattened. is achieved. The false-twisted yarn of the present invention has no course spots, gloss spots, or fibrillation spots, and can be used as stockings with a beautiful appearance. To my surprise, the false twisted yarn of the present invention allows for stockings that are soft and highly transparent. If the filament flatness of the raw yarn supplied for false twisting is less than 1.3, the cross section of the filament after false twisting will not become obtuse, and the appearance, softness, and transparency of the stockings will not be improved. On the other hand 2-
If it exceeds 5, the spinnability and false twisting processability deteriorate, and unevenness tends to occur during the false twisting process, which is not useful. A more desirable flatness of the filament is 1.5 to λO. There are various flat shapes of filaments. For example, as shown in FIG. 3, there are cross shapes, triangular shapes, elliptical shapes, dog horn shapes, etc., but any shape is effective. The most effective shapes are elliptical and doghorn shapes.

The false twisted yarn of the present invention is used for stockings, and if the yarn has a total denier of less than 1 od, it will have poor wear durability and little practical value. Moreover, if the length exceeds 50 d, the stocking will be thick and no transparency will be achieved no matter what the filament cross section or configuration. If the denier of the filament is thinner than 2d, pilling may occur when wearing stockings and problems may arise in durability. If it exceeds 5, the effect of soft feeling will not be exhibited and the stockings will become rough and stiff.

Example Examples of non-invention are shown below.

Example 1 Using nylon 66 as a raw material, a melting temperature of 295°C, a winding speed of 800 m/min, a spinneret hole shape of a slit, and three slit lengths were used to produce 4815 oval filaments. 'It was wound up as a thread. This undrawn yarn was wound up. This undrawn yarn is circumscribed by 3'f411
Number of twists is 7200 T/M with friction false twisting machine, heater temperature 21
0d, stretching time 5J-3.2 times, yarn speed soo"/f
+-r: (Et, m processing was carried out to obtain a false twisted yarn of 1515. For comparison, ordinary round cross-section filament was spun and twisted in the same manner. This false twisted yarn 4 pieces of 32 gauge are arranged alternately in the twisting direction S12.
Stockings were knitted using a 0-knit stocking machine, dyed, and finished to produce a product. The stocking properties of this product were investigated based on sensory values. The results are shown in Table 1.

Example 2 Using nylon 66 as a raw material, the melting temperature was 295°C, the winding speed was 950 m/min, the hole shape of the spinneret was used as a slit, and the slit length was 117d/13' using three types.

The undrawn yarn of elliptical filament of 3.1
The yarn was stretched twice and wound into a 40/13' drawn yarn. This drawn yarn is twisted at 4,600 twists using a pintaizo temporary combustion machine.
False twisting was performed at T/M and heater temperature of 210°C. In addition, as a comparative yarn, a normal round cross-section was spun and false-twisted using the same method. Four of these false twisted yarns were arranged alternately in the SSZ twisting direction, and stockings were knitted using a 32 gauge 40-knit stocking machine, and dyed and finished to produce a product. The stocking properties of this product were investigated using sensory values. The results are shown in Table 1.

(Margin) No. 1 and No. 5 shown in Table 1 are conventional regular products, and they have problems with soft feel, transparency, and beauty of appearance. No.3. No. 7 was based on the present invention, and it was obtained that sufficiently satisfied the wearing performance. No.2. No. 6 has a small flatness, and the effects of the present invention, such as soft feel, transparency, and beautiful appearance, cannot be fully exhibited. Also, No.4. No.8
Since the flatness of the stockings was too large, the appearance of the stockings was poor due to processing irregularities and fluff caused by false twisting.

Effects of the Invention According to the present invention, a false-twisted yarn can be obtained that satisfies the performance of stockings, which has not been available in the past, such as size-fitting properties, soft feel, transparency, and beautiful appearance.

[Brief explanation of drawings]

Figure 1 shows an example of the cross-sectional shape of the filament according to the present invention, (a) is the cross-section of the raw yarn before false twisting, (b) is the cross-section of the false-twisted yarn, and Figure 2 is the cross-section of the filament before false twisting. Showing the cross-sectional shape of the filament, (a)
(b) is a cross-section of the raw yarn before being twisted, and (b) is a cross-section of the false-twisted yarn. FIG. 3 shows examples of flat shapes of filaments according to the present invention, in which (a) is a cross shape, (b) is a triangular shape, (c) is an elliptical shape, and (b) is a doghorn shape. Patent applicant: Asahi Kasei Industries, Ltd. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. A multifilament of polyamide synthetic fiber, and the cross section of the filament has an oblateness of 1.3 to 2.5.
False-twisted yarn for stockings characterized by false-twisting flat-shaped raw yarn of Claims where the value expressed by a/b is 2, the denier of the filament is 2 to 5 d, and the total denier of the false twisted yarn is 10 to 50 d, when side (a) and short side (b) are taken as False twisted yarn as described in item 1